<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./lib/vue.js"></script>
</head>

<body>
    <div id="app">
        <input type="text" v-model="info.username">
    </div>
    <script>
        const vm = new Vue({
            el: '#app',
            data: {
                info: {
                    username: 'admin'
                }
            },
            methods: {},
            filters: {},
            watch: {
                // info: {
                //     handler(newValue) {
                //         console.log(newValue)
                //     },
                //     // 开启深度监听
                //     deep: true
                // },
                'info.username' (newValue) {
                    console.log(newValue)
                }
            }
        })
    </script>
</body>

</html>